Piston and connecting rod



A. E. REID PISTON AND CONNECTING ROD April 29, 1930.

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Filed Feb. 26, 1929 Patented Apr. 29, 1930 UNITED sures earner err-iceAIlLLAN E. REID, 0F BOSTON, MASSACHUSETTS, ASSIGNCR TO REID PISTONCOMPANY, OF BROOKLINE, MASSACHUSETTS, A CORPORATION OF.LJIASSACI-IUSETTS PISTON AND CONNECTING ROD Application filed February26, 1929. Serial No. 342,917.

This invention pertains to connecting rods and pistons of the typecommonly employed in internal combustion engines, air compressore andthe like, and relates more particular.-

1y to improved means'for uniting apiston and connecting rod. In my,co-pending applica tion ,Serial No. 827,006 filed December 19, 1928, Ihave described some of the practical difliculties arising from the useof the usual wrist pin for uniting the piston and-rod, and

have broadly disclosed means illustrative of a novel genus'of connectingmeans of which the present invention is a specific embodiment. In theaforesaid application I described and broadly claimed an arrangement inwhich the usual separate wrist pin is eliminated with. consequentimproved function and increased facility in assembly and separation ofthe parts, together with certain specific illustrations thereof, whereina pivot member permanently united to the connecting rod turns in abearing disposed inside of the piston.

. In accordance with the present invention I affix the pivot member tothe piston, as for example making it an integral projection upon theinner surface of the piston, and with this pistonl employ a connectingrod which does not differ, except optionally as to the diameter of itsjournal opening, from connecting rods of usual type. Thisarrangementpossesses the desirable characteristics inherent in thegeneric construction, as more fully set forth in my aforesaidapplication, and as compared with the specific disclosure of saidapplication possesses certain further advantages, as for example thepermissive use of a connecting rod of substantially usual type, asalready mentioned,simplification of parts, and greater ease inmanufacture.

In the accompanying drawings, one desirable embodiment of the inventionis illustrated by way of example, and in the drawings,

Fig. 1 is a vertical section, partly in elevat-ion, showing the pistonand a part of its associated connecting rod and indicating the enginecylinder in broken lines;

Fig. 2 is a view similar to Fig. 1 but omitting the connecting rod andcylinder;

Fig. 3 isa transverse section substantially v on the line 33 of Fig. 2;and

F'g. i is a vertical section on the line H of Fig.1, omittingthecylinder.

Referring to the drawings,'the invention isillustrated as embodied in atrunk piston 1 having the usual skirt portion 2 and head3, such pistonsbeing commonly employed 1n in ternal combustion engines. In Fig. 1, the

piston is illustrated'as disposed within a cylinder 4 having a head 5.

VVithin' the piston I provide suitablesupporting means, for example thewebs 6, 7

and 8, (Fig. 3) projecting integrally from 66 material, for examplebronze having a finished peripheral surface. The supporting webs 6, 7and 8 engage the cylindrical pivot member 9 at one end and support itwith its his transverse to the axis of the piston and preferably, thoughnot necessarily, at a point such that it is substantially symmetricalwith the axis of the piston. That is to say, the ends ofthis cylindricalmember 9 are preferably at substantially equal distances from the axisof the piston. V I Preferably the piston wall is furnished with anopening 11 through which suitable tools maybe introduced for machiningand finishing the pivot member 9 with its bushing 10. The free orunsupported end 12 of the pivot member is spaced from the inner surfaceof thepiston body, as shown at 13, sufliciently to permit the head 14 ofa connect ing rod 15 to be introduced between the end 1 2of thepivotmember and the inner surface of the piston body, as indicated inbroken lines in Fig. 1.

. Thus, in assembling the parts, the end of V provided with an internalboss 19 of tapering sembled in this manner, the other en'd'of theconnecting rod is attached to the crank on the crank shaft of the engineand is thereby kept in operative engagement with the pivot member 9.

Preferably the head 14 of the connecting rod is split and provided.with. outstanding bosses 16 and 17 at opposite sides of the gap,

'such'bosses receiving an adjusting bolt or screw 18, whereby theeffective diameter of.

the journal opening in the connecting rod may be varied to take up wear.Since the head of the bolt 18 is exposed at the open end of the piston,wear may be taken up without removing the piston from the cylinder.

fdesired, the head of the piston may be form adapted to collect oil andto direct it to an oil receiving opening or openings 20 in the head 110f the connecting rod.

\Vhile I have shown integral webs 6, 7 and 8 for supporting the pivotmember, I contemplate that other means may be used for retaining thispart in 'operative position, and while the pivot member has here beenshown as disposed symmetrically with respect to the axis of the piston,this is not wholly necessary, and-its position may be varied inaccordance with circumstances, provided, however, that its free end isalways spaced'from the piston wall sui'liciently to admit the head ofthe con necting rod between them.

I claim:

1. The combination of a piston with a connecting red, the connecting rodhaving a journal opening whose axis is transverse to that of the piston,and a pivot member permanently united tothe piston and adapted to fitwithin the opening in the connecting rod.

2. The combination of a hollow piston with a connecting rod, theconnecting rod having ajournal opening and the piston having an internalpivot member permanently united to it,

saidconnecting rod being capable of assembly with the piston by movementof the connecting rod relatively to the piston such as to cause thejournal opening in the rod to slip axially over the pivot member.

3. The combination of a piston and connecting rod useful in an internalcombustion engine having a cylinder, said piston having a V pivot memberpermanently attached at one end to the piston body and free at its otherend, the free end of the pivot member being spaced from adjacent partsto permit assembly of the connecting rod with the pivot mem ber withoutwithdrawing the piston from the cylinder.

at. The combination with a trunk piston having a member projectingintegrally from its inner surface, said member having a finishedcylindrical portion constituting a pivot, with a connecting rod having ajournal openingfor the reception of said pivot.

5. A trunk piston having an internal'pivot member-disposed with its axistransverse to that of the piston, and means permanently; connecting saidpivot member tothe piston body, said pivot member being free at one endat least to permit assemblage of a connecting rod therewith withoutdisturbing the connection between the pivot member and the piston body.

6. A. trunk piston having an internal pivot member disposed with itsaxis transverse to that of the piston, and means permanently connectingsaid pivot member to the pistonbody, said pivot member being arrangedsymmetrically with respect to the axis of thepis ton and being spaced atone'end'at least from the piston wall to permit assemblage of a con:necting rod therewith. 7

7. A trunk piston having an internal pivot member of annular formdisposed symmetri 1 cally with respect to the axis of the piston andwith'the axis of the pivot member transverse to that of the piston, andmeans engaging one end of the pivot Inemberfor-permanently attach-ingitto the piston body, the other end of the pivot member being spaced fromthe inner surface of the piston.

8. A trunk piston having webs projecting from its inner surface andasubstantially cylindrical bearing member united at one end to said websand supported thereby, the other end of the pivot member being free andextending beyond the webs for operative engagement with a connectingrod.

9. A trunk piston having an internal pivot member of substantiallycylindrical form, and means uniting one end of said pivot'member to thepiston body, the other end of the pivot member being free, said pivotmember comprising a bushing of wear resistantmaterial adapted to enterwithin a journal opening in a-connecting rod whereby to form anarticulated joint between the piston and rod;

Signed by me at Boston, Massachusetts, this 23rd day of February, 1929.

ALLAN E. REID.

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